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Update readme #4

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AndreyKozhevnikov Nov 15, 2023
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*Files to look at*:

* [Order.cs](CS/EFCore/MasterPropertiesEF/MasterPropertiesEF.Module/BusinessObjects/Order.cs)
* [Product.cs](CS/EFCore/MasterPropertiesEF/MasterPropertiesEF.Module/BusinessObjects/Product.cs)
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# How to calculate a master property based on values from a details collection
# XAF - How to calculate a master property based on values from a detail collection

This example implements a business class that has one of its properties calculated based on properties of objects contained in the child object collection.

<p>See the <a href="http://documentation.devexpress.com/#Xaf/CustomDocument3179">How to: Calculate a Property Value Based on Values from a Detail Collection</a> help topic for more information.</p><p><strong>See Also:</strong><br />
<a href="https://www.devexpress.com/Support/Center/p/A2944">XPO Best Practices</a><br />
<a href="https://www.devexpress.com/Support/Center/p/E975">How to display details collections with descendant classes filtered by object type in a DetailView</a></p>
![chrome_HiLXq4Oolu](https://github.com/DevExpress-Examples/XAF_how-to-calculate-a-master-property-based-on-values-from-a-details-collection-e305/assets/14300209/66c95bc7-11b2-4b9d-9754-03d93c91066a)

<br/>
For EF Core, review the following files for implementation details:
- [Order.cs](CS/EFCore/MasterPropertiesEF/MasterPropertiesEF.Module/BusinessObjects/Order.cs)
- [Product.cs](CS/EFCore/MasterPropertiesEF/MasterPropertiesEF.Module/BusinessObjects/Product.cs)

For XPO, review the following files:

- [Order.cs](CS/XPO/MasterProperties/MasterProperties.Module/BusinessObjects/Order.cs)
- [Product.cs](CS/XPO/MasterProperties/MasterProperties.Module/BusinessObjects/Product.cs)

You can also refer to the following help topic for a step-by-step instructions: [Calculate a Property Value Based on Values from a Detail Collection (XPO)](https://docs.devexpress.com/eXpressAppFramework/113179/business-model-design-orm/business-model-design-with-xpo/calculate-a-property-value-based-on-values-from-a-detail-collection)

## Files to Review

- [Order.cs](CS/EFCore/MasterPropertiesEF/MasterPropertiesEF.Module/BusinessObjects/Order.cs)
- [Product.cs](CS/EFCore/MasterPropertiesEF/MasterPropertiesEF.Module/BusinessObjects/Product.cs)

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## Does this example address your development requirements/objectives?
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